Merge pull request #11 from cnnic/dev

Dev
Merge pull request #12 from cnnic/dev

Dev
fix ipv4 bug
Merge commit '88a128033e62379cc81cb8ec74bb1985b8af8fac' into dev
Merge commit 'ba4d623c7ab2207ee73cf60b1e553898d6be22c2' into dev
Merge commit 'e7029e01cd7442ba010afa1884b24c80842751f6' into dev
Merge remote-tracking branch 'remoteGit/dev' into dev
fix bug ipv4
add nameserversearch test xml
modify ns search function
add NSSearch test file
Merge pull request #96 from wade1012/dev

fix bug ipv4